204
FNCA52 TJSJ 211930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST THU MAY 21 2026
DISCUSSION
NO FIRE DANGER IS EXPECTED TODAY.
PRZ014-220800-
SOUTHEAST COASTAL PLAINS-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 50 50 10 0
TEMP (24H TREND) 72 (-2) 89 (+2) 72 90
RH % (24H TREND) 91 (+8) 52 (-2) 91 48
WIND 20FT/EARLY(MPH) E 14 E 16 E 13 E 17
WIND 20FT/LATE(MPH) E 12 E 16 E 12 E 17
MIXING HGT(FT-AGL/MSL) 4940 4700
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 74100 65800
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-220800-
SOUTHERN HILLS-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 10 10
TEMP (24H TREND) 68 (-3) 85 (+2) 69 86
RH % (24H TREND) 98 (+10) 62 (-2) 97 59
WIND 20FT/EARLY(MPH) E 12 E 12 E 12 E 13
WIND 20FT/LATE(MPH) E 13 E 13 E 12 E 12
MIXING HGT(FT-AGL/MSL) 5440 5250
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 76160 68250
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-220800-
NORTH COASTAL PLAINS-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 20 20
TEMP (24H TREND) 72 (-1) 88 (0) 72 88
RH % (24H TREND) 97 (+7) 61 (0) 98 60
WIND 20FT/EARLY(MPH) E 16 E 14 E 17 E 16
WIND 20FT/LATE(MPH) E 13 E 19 E 12 E 19
MIXING HGT(FT-AGL/MSL) 5250 4780
TRANSPORT WND (MPH) E 15 E 16
VENT RATE (KT-FT) 68250 66920
DISPERSION 5 5
DSI 5 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-220800-
NORTHERN HILLS-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 70 10 40
TEMP (24H TREND) 69 (-2) 87 (+1) 69 87
RH % (24H TREND) 97 (+5) 64 (+4) 98 63
WIND 20FT/EARLY(MPH) E 13 E 13 E 14 E 13
WIND 20FT/LATE(MPH) E 9 E 16 E 9 E 18
MIXING HGT(FT-AGL/MSL) 6070 5190
TRANSPORT WND (MPH) E 13 E 13
VENT RATE (KT-FT) 66770 57090
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-220800-
WEST COAST-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 20 50 20 40
TEMP (24H TREND) 71 (-2) 90 (+1) 72 89
RH % (24H TREND) 94 (+6) 62 (+1) 96 61
WIND 20FT/EARLY(MPH) E 13 E 14 E 10 E 13
WIND 20FT/LATE(MPH) E 12 E 14 E 9 E 13
MIXING HGT(FT-AGL/MSL) 5070 4540
TRANSPORT WND (MPH) E 13 E 10
VENT RATE (KT-FT) 55770 40860
DISPERSION 5 5
DSI 5 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-220800-
EASTERN INTERIOR-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 20 20
TEMP (24H TREND) 69 (-3) 87 (+2) 70 87
RH % (24H TREND) 99 (+9) 62 (-1) 98 61
WIND 20FT/EARLY(MPH) E 14 E 13 E 13 E 14
WIND 20FT/LATE(MPH) E 16 E 13 E 13 E 13
MIXING HGT(FT-AGL/MSL) 5680 5030
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 79520 65390
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-220800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 30 20
TEMP (24H TREND) 68 (-3) 83 (+3) 68 83
RH % (24H TREND) 100 (+7) 67 (-3) 100 65
WIND 20FT/EARLY(MPH) E 12 E 12 E 11 E 12
WIND 20FT/LATE(MPH) E 13 E 12 E 10 E 11
MIXING HGT(FT-AGL/MSL) 4620 3450
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 69300 48300
DISPERSION 5 5
DSI 6 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-220800-
CENTRAL MOUNTAIN RANGE-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 80 10 40
TEMP (24H TREND) 66 (-3) 84 (+3) 66 85
RH % (24H TREND) 98 (+7) 67 (+2) 99 64
WIND 20FT/EARLY(MPH) E 9 E 10 E 8 E 10
WIND 20FT/LATE(MPH) E 8 E 10 E 8 E 11
MIXING HGT(FT-AGL/MSL) 6720 5630
TRANSPORT WND (MPH) E 12 E 10
VENT RATE (KT-FT) 67200 50670
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-220800-
CAYEY MOUNTAIN RANGE-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 20 10
TEMP (24H TREND) 68 (-2) 82 (+1) 69 83
RH % (24H TREND) 100 (+7) 67 (-1) 100 65
WIND 20FT/EARLY(MPH) E 11 E 11 E 10 E 11
WIND 20FT/LATE(MPH) E 11 E 11 E 10 E 11
MIXING HGT(FT-AGL/MSL) 5060 4080
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 75900 57120
DISPERSION 5 5
DSI 5 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-220800-
VIEQUES-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 40 20
TEMP (24H TREND) 77 (+1) 88 (0) 77 89
RH % (24H TREND) 85 (+1) 59 (0) 86 57
WIND 20FT/EARLY(MPH) E 19 E 16 E 17 E 17
WIND 20FT/LATE(MPH) E 18 E 17 E 18 E 17
MIXING HGT(FT-AGL/MSL) 3870 3360
TRANSPORT WND (MPH) E 21 E 23
VENT RATE (KT-FT) 69660 67200
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-220800-
CULEBRA-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 30 20
TEMP (24H TREND) 77 (0) 90 (+2) 77 91
RH % (24H TREND) 86 (+3) 56 (-6) 87 55
WIND 20FT/EARLY(MPH) E 19 E 16 E 17 E 17
WIND 20FT/LATE(MPH) E 18 E 16 E 18 E 17
MIXING HGT(FT-AGL/MSL) 4170 3420
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 75060 64980
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-220800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 0 20
TEMP (24H TREND) 73 (-2) 90 (+2) 73 89
RH % (24H TREND) 88 (+9) 51 (-3) 90 52
WIND 20FT/EARLY(MPH) E 19 E 20 E 16 E 19
WIND 20FT/LATE(MPH) E 18 SE 20 E 12 E 19
MIXING HGT(FT-AGL/MSL) 4930 4820
TRANSPORT WND (MPH) E 21 E 17
VENT RATE (KT-FT) 88740 72300
DISPERSION 5 5
DSI 6 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-220800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 20 20
TEMP (24H TREND) 77 (0) 86 (+2) 77 87
RH % (24H TREND) 86 (+3) 62 (-5) 86 60
WIND 20FT/EARLY(MPH) E 19 E 16 E 18 E 18
WIND 20FT/LATE(MPH) E 18 E 16 E 18 E 17
MIXING HGT(FT-AGL/MSL) 3960 3430
TRANSPORT WND (MPH) E 21 E 23
VENT RATE (KT-FT) 71280 68600
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-220800-
ST CROIX-
330 PM AST THU MAY 21 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 30 20
TEMP (24H TREND) 77 (+1) 88 (+1) 77 88
RH % (24H TREND) 87 (+4) 61 (-2) 88 61
WIND 20FT/EARLY(MPH) E 18 E 17 E 18 E 17
WIND 20FT/LATE(MPH) E 17 E 16 E 18 E 17
MIXING HGT(FT-AGL/MSL) 4690 3780
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 84420 71820
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page